MCQ Questions for Class 10 Science: Ch 4 Carbon and Its Compounds

1. The first compound to be prepared in the laboratory was
(a) Methane
(b) Ethyl alcohol
(c) acetic acid
(d) Urea
► (d) Urea

2. C3H8 belongs to the homologous series of
(a) Alkynes
(b) Alkenes
(c) Alkanes
(d) Cyclo alkanes
► (c) Alkanes

3. The number of isomers of pentane is
(a) 2
(b) 3
(c) 4
(d) 5
► (b) 3

4. Soaps are formed by the saponification of
(a) Alcohols
(b) simple ester
(c) carboxylic acids
(d) glycerides
► (d) glycerides

5. Enzyme which converts starch into glucose is
(a) Zymase
(b) Maltase
(c) Diastase
(d) Invertase
► (a) Zymase

6. When ethanoic acid is treated with NaHCO the gas evolved is
(a) H2
(b) CO2
(c) CH4
(d) CO
► (b) CO2

7. Rectified spirit is
(a) 50% ethanol
(b) 80% ethanol
(c) 95% ethanol
(d) 40 to 50% ethanol
► (c) 95% ethanol

8. Which of the following will undergo addition reactions?
(a) CH4
(b) C3H8
(C) C2H6
(d) C2H4
► (d) C2H4

9. The IUPAC name of CH3CHO is
(a) Acetaldehyde
(b) Formaldehyde
(c) Methyl formaldehyde
(d) Ethanal
► (d) Ethanal

10. Why does carbon form compounds mainly by covalent bonding?
(a) There are four electrons in the outermost shell of carbon.
(b) It requires large amount of energy to form C4+ or C4-
(c) It shares its valence electrons to complete its octet.
(d) All the above
► (d) All the above

11. Ethanol on complete oxidation gives
(a) acetic acid/ethanoic acid
(b) CO2 and water
(c) ethanal
(d) acetone/ethanone
► (b) CO2 and water

12. The by product in soap industry is
(a) Isoprene
(b) Ethylene glycol
(c) glycerol
(d) butane
► (c) glycerol

13. Addition reactions are undergone by
(a) saturated hydrocarbons (alkanes)
(b) only alkenes
(c) only alkynes
(d) both alkenes and alkynes
► (d) both alkenes and alkynes

14. The number of C-H bonds in ethane C2H6 molecule are
(a) 4
(b) 6
(c) 8
(d) 10
► (b) 6

15. Which of the following belongs to homologous series of alkynes?
C6H6, C2H6, C2H4, C3H4.
(a) C6H6
(b) C2H4
(C) C2H6
(d) C3H4
► (d) C3H4

16. Diamond is not a good conductor of electricity because
(a) It is very hard
(b) Its structure is very compact
(c) It is not soluble in water
(d) It has no free electrons to conduct electric current.
► (d) It has no free electrons to conduct electric current.

17. The firSt member of the alkyne homologous series is
(a) propyne
(b) ethyne
(c) methane
(d) ethene
► (b) ethyne

18. The odour of acetic acid resembles that of
(a) Rose
(b) Burning Plastic
(c) Vinegar
(d) Kerosene
► (c) Vinegar

19. A soap molecule has a
(a) hydrophobic head and hydrophobic tail
(b) hydrophobic head and hydrophilic tail
(c) hydrophilic head and hydrophilic tail
(d) hydrophilic head and hydrophobic tail
► (d) hydrophilic head and hydrophobic tail

20. Alcohols can be produced by the hydration of
(a) Alkenes
(b) alkynes
(c) alkanes
(d) acids
► (a) Alkenes

21. In diamond, each carbon atom is bonded to four other carbon atoms to form
(a) a hexagonal array
(b) a rigid three-dimensional structure
(c) a structure in the shape of a football
(d) a structure of a ring
► (b) a rigid three-dimensional structure

22. Butanone is a four carbon compound with the functional group
(a) carboxylic acid
(b) aldehyde
(c) ketone
(d) alcohol
► (c) Ketone

23.  IUPAC name of first member of homologous series of ketones is
(a) Ethanone
(b) methanone
(c) Propanone
(d) Butanone
► (c) Propanone

24. Solubility of alcohol in water is due to
(a) low density of alcohol
(b) volatile nature of alcohol
(c) ionisation
(d) hydrogen bonding
► (d) hydrogen bonding

25. —CHO represents the functional group
(a) esters
(b) carboxylic acid
(c) alcohols
(d) aldehydes
► (d) aldehydes

26. Which of the following is ethanol?
(a) CH3CHO
(b) CH3COOH
(c) CH3CH2
(d) CH3COOCH3
► (c) CH3CH2

27. While cooking, if the bottom of the vessels is getting blackened on the outside, it
means that
(a) the fuel is not cooked completely.
(b) the fuel is not burning completely.
(c) the fuel is wet.
(d) the is burning completely.
► (b) the fuel is not burning completely.

28. Which of the following statements about graphite and diamond is true?
(a) They have the same crystal structure
(b) They have the same degree of hardness
(c) They have the same electrical conductivity
(d) They can undergo the same chemical reactions
► (d) They can undergo the same chemical reactions

29. The difference in the formula and molecular masses of CH3OH and C2H5OH is
(a) CH3 and 16 u
(b) CH2 and 14u
(c) CH4 and 18u
(d) CH3 and 16u
► (b) CH2 and 14u

30. The number of covalent bonds in C4H10 is
(a) 10
(b) 8
(c) 13
(d) 12
► (c) 13

31. The self linkage property (catenation) is maximum in
(a) carbon
(b) silicon
(c) sulphur
(d) phosphorus
► (a) carbon

32. Carbon exists in the atmosphere in the form of
(a) carbon monoxide only
(b) carbon monoxide in traces and carbon dioxide
(c) carbon dioxide only
(d) coal
► (b) carbon monoxide in traces and carbon dioxide

33. Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of
(a) Addition reaction
(b) Substitution reaction
(c) Displacement reaction
(d) Oxidation reaction
► (a) Addition reaction

34. Ethanol reacts with Na metal to form
(a) CH3ONa + H2
(b) C2H5ONa + H2
(c) CH3COONa + H2
(d) CH3C00H + H2O
► (b) C2H5ONa + H2

35. Assertion: Ethanoic acid reacts with ethyl alcohol in presence of cone H2SO4 to form ethyl ethanoate.
Reason: Esters are used in ice creames and cold drinks.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.
► (b) Both A and R are true but R is not the correct explanation of A.

36. Assertion: Soaps are 100% biodegradable but do not work well with hard water.
Reason: Some detergents are not bio-degradable but work well with hard water.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.
► (b) Both A and R are true but R is not the correct explanation of A.

37. Ethane and ethene can be distinguished by
(a) Br2(l)
(b) Br2 (aq) water
(c) Cl2
(d) I2
► (b) Br2 (aq) water

38. Which of the following contains covalent bond?
(a) MgCl2
(b) CaF2
(c) Al2O3
(d) HCl
► (d) HCl

39. Which amongst the following will conduct electricity?
(a) C6H12O6
(b) KCl(s)
(c) C2H5OH
(d) NaCl (aq)
► (d) NaCl (aq)

40. Artificial flavour for orange is obtained from
(a) amyl acetate
(b) isoamyl valerate
(c) methyl butyrate
(d) octyl acetate
► (d) octyl acetate
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